'Twilight' star Ashley Greene is teaming up with DonateMyDress.org to help teen girls in need find perfect prom dresses.

For the third year in a row Ashley has signed on to be the spokesperson for the national organization, which takes donations of new and gently used special occasion dresses and matches them with teen girls in need, who otherwise might not have been able to attend their proms. Ashley knows how hard it is for some to come up with the money for a special event like prom: “In high school, I had to work several jobs to save enough to buy a prom dress. It was so worth it: I had a blast at prom! Every girl should have the chance to have that experience.”

Today Ashley is hosting a live Twitter talk session from 4:30-4:45 where followers can ask her their prom-related questions.

If you're interested in finding a local donation/receiving site, you can check their website here.

Kathleen Spencer is a pop culture fanatic, movie aficionado, lover of celebrity gossip and is a confessed mommy blog addict. Kathleen has a decade of experience writing about the trials, tribulations and triumphs of celebrities and their cohorts.